What’s Vulnerable › Vulnerabilities

CVE-2014-4650

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 23.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-02-20 · updated 2026-06-17
• Weakness: CWE-22

Description

The CGIHTTPServer module in Python 2.7.5 and 3.3.4 does not properly handle URLs in which URL encoding is used for path separators, which allows remote attackers to read script source code or conduct directory traversal attacks and execute unintended code via a crafted character sequence, as demonstrated by a %2f separator.

Affected products

• Python: from 2.7.0 before 2.7.8; from 3.2.0 before 3.2.6; from 3.3.0 before 3.3.6; from 3.4.0 before 3.4.2 — fixed in 2.7.8, 3.2.6, 3.3.6, 3.4.2
• Red Hat Enterprise Linux: 5.0, 6.0, 7.0
• RedHat Software Collections: all versions

How to fix

Upgrade to a fixed version: Python 2.7.8, 3.2.6, 3.3.6, 3.4.2. Check the vendor advisory for mitigations.

References

• http://bugs.python.org/issue21766
• http://openwall.com/lists/oss-security/2014/06/26/3
• https://access.redhat.com/security/cve/cve-2014-4650
• http://bugs.python.org/issue21766
• http://openwall.com/lists/oss-security/2014/06/26/3
• https://access.redhat.com/security/cve/cve-2014-4650

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